Collector accounts

Hello people.

I was haveing problems creating collector account, what I want to do is, creat an account called "collector@mydomain" when the clients send an email to this account, thouse mails must be delivered to one of the accounts from mydomain, dinamicaly. do you know what I meen?
I say, I send 10 mail from somewhere outthere to collector@mydomain, I have 5 accounts under mydoain, and the server must recives those emails, and deliver the emails 2 for each account.
I hope you can help me.
thank you for your attention, and Iīm sorryed for my bad enlish, I speak spanish and german